The joint Russian-Belarusian-Serbian military exercise Slavic Brotherhood 2021 advanced Russian efforts to gain control over the Belarusian military and cultivate partner forces that the Kremlin can use in future Russian deployments. Russia and Belarus operated integrated combat units at the company level for the first time, building on previous exercises fielding combined battalions. The Kremlin practiced integrating non-Belarusian troops into Russian-controlled companies and platoons for the first time—a dangerous development that will expand Russian control over the militaries of sovereign states, enhance Russian force generation capabilities, and help the Kremlin obfuscate its military activity by framing Russian activities as multilateral. The Kremlin will develop these capabilities further in future exercises, including the upcoming annual capstone strategic readiness exercise, Zapad 2021, in September.

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